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/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.handler.codec.compression;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.util.internal.ObjectUtil;
import net.jpountz.lz4.LZ4Exception;
import net.jpountz.lz4.LZ4Factory;
import net.jpountz.lz4.LZ4FastDecompressor;
import java.util.List;
import java.util.zip.Checksum;
import static io.netty.handler.codec.compression.Lz4Constants.*;
/**
* Uncompresses a {@link ByteBuf} encoded with the LZ4 format.
*
* See original LZ4 Github project
* and LZ4 block format
* for full description.
*
* Since the original LZ4 block format does not contains size of compressed block and size of original data
* this encoder uses format like LZ4 Java library
* written by Adrien Grand and approved by Yann Collet (author of original LZ4 library).
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* * Magic * Token * Compressed * Decompressed * Checksum * + * LZ4 compressed *
* * * * length * length * * * block *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*/
public class Lz4FrameDecoder extends ByteToMessageDecoder {
/**
* Current state of stream.
*/
private enum State {
INIT_BLOCK,
DECOMPRESS_DATA,
FINISHED,
CORRUPTED
}
private State currentState = State.INIT_BLOCK;
/**
* Underlying decompressor in use.
*/
private LZ4FastDecompressor decompressor;
/**
* Underlying checksum calculator in use.
*/
private ByteBufChecksum checksum;
/**
* Type of current block.
*/
private int blockType;
/**
* Compressed length of current incoming block.
*/
private int compressedLength;
/**
* Decompressed length of current incoming block.
*/
private int decompressedLength;
/**
* Checksum value of current incoming block.
*/
private int currentChecksum;
/**
* Creates the fastest LZ4 decoder.
*
* Note that by default, validation of the checksum header in each chunk is
* DISABLED for performance improvements. If performance is less of an issue,
* or if you would prefer the safety that checksum validation brings, please
* use the {@link #Lz4FrameDecoder(boolean)} constructor with the argument
* set to {@code true}.
*/
public Lz4FrameDecoder() {
this(false);
}
/**
* Creates a LZ4 decoder with fastest decoder instance available on your machine.
*
* @param validateChecksums if {@code true}, the checksum field will be validated against the actual
* uncompressed data, and if the checksums do not match, a suitable
* {@link DecompressionException} will be thrown
*/
public Lz4FrameDecoder(boolean validateChecksums) {
this(LZ4Factory.fastestInstance(), validateChecksums);
}
/**
* Creates a new LZ4 decoder with customizable implementation.
*
* @param factory user customizable {@link LZ4Factory} instance
* which may be JNI bindings to the original C implementation, a pure Java implementation
* or a Java implementation that uses the {@link sun.misc.Unsafe}
* @param validateChecksums if {@code true}, the checksum field will be validated against the actual
* uncompressed data, and if the checksums do not match, a suitable
* {@link DecompressionException} will be thrown. In this case encoder will use
* xxhash hashing for Java, based on Yann Collet's work available at
* Github.
*/
public Lz4FrameDecoder(LZ4Factory factory, boolean validateChecksums) {
this(factory, validateChecksums ? new Lz4XXHash32(DEFAULT_SEED) : null);
}
/**
* Creates a new customizable LZ4 decoder.
*
* @param factory user customizable {@link LZ4Factory} instance
* which may be JNI bindings to the original C implementation, a pure Java implementation
* or a Java implementation that uses the {@link sun.misc.Unsafe}
* @param checksum the {@link Checksum} instance to use to check data for integrity.
* You may set {@code null} if you do not want to validate checksum of each block
*/
public Lz4FrameDecoder(LZ4Factory factory, Checksum checksum) {
decompressor = ObjectUtil.checkNotNull(factory, "factory").fastDecompressor();
this.checksum = checksum == null ? null : ByteBufChecksum.wrapChecksum(checksum);
}
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List
